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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b44acdb56b2f186b6fe8355742711b07fde7ab7c090e5d83b345829893607b5' 
  AND token = 'nbS6Th+OjOWKyiSsae1zLVp9i2pfJhXG6ySATZG1IZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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