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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2342fce7e3a0f776ac6c95c95596fa08f88563269c41c8c4277a84efb1cbbe53' 
  AND token = 'yJMRJlU2SrbeVXJRvWjtC4wWJsY/5BHjWwhaF6fcsK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}