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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '475109ef5aed245610e1dd444c5b05bda3aeb048c1767be68fc389cf180bf4b2' 
  AND token = '1ftCbbChF00GtofUR8+0Ul0CseVRV2B46aVPcZvv3E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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