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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a03c72f9f68de57e12138c031431fded6428bfa43c76305d74f7010b31a82f0' 
  AND token = 'f7i8Sui0b0D3mBJXmdtMVeG/5ksgsvybxXzAwLQsc0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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