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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '353a6948f1c68de0ab688a0fe6de0ae8c4dd1f88e62ca7d07b414be3d640db73' 
  AND token = 'bv/JJLSbc9ZY1i9dXScYSa1elAsvSm6NA5V769sN0ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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