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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12be6cd0ca4e7481008d80e2b8cda1c57224c0a39b9b80ed97c2e17a3d3455c3' 
  AND token = 'n6GN2t39F8moUnr+nTHRDzMN5aqVVALvW3HlMCGPlBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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