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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86b0c709931d510c5116cdd29ade678d73da2df29862b1ee3345e133c52e58a' 
  AND token = '/WOQSFKNQy3fpr+Kn7xsf0CzZfs/VUwR4sESIM6hWZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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