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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '014f8d55ebcb0c7813ebaa66f5536ac62d12812dd7d37fb0c5a7c407f20743ce' 
  AND token = 'fMgTqSBWtJJPgMlcuvWkkrp3IP394PSXI4QZ7NSTLEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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