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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84a8df527596e0c9618549bac7819293d8fe244a10b98ef0c68d81e95e4239c1' 
  AND token = 'FBwDn9rCD67G4Waxu+BVhUQclC7spkZ6fEYZVUFTFII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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