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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd154cbbaaac7a5afaa7bae496982686079e5a2e84b32d7203b6712410b097ad0' 
  AND token = 'NqjMbsvrXrgg9/S75Nm/J/90lZN+szL8z+C4GXByOn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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