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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10a9e99d41c61361b437d1a568b9c38cff5c2a0b9878bc6b0afab216afbb3fb7' 
  AND token = 'FKht0o6FioudLtv8KEgy5e4wVCDQGeX8d/D8O6Ju+6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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