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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70aee221e514e2eacddf6e1ff8878684a8fe0105c270b507297a4365d86f82a8' 
  AND token = 'p5JzvMTOtgn64lZ49c5OKktMIg9Coy3rsCKxPq7w4qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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