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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08ccb1a0c8e9d1c55a9abb0d236c3476ac32f4b4ded1dc62a8152c76c46433c' 
  AND token = 'yoDC4X1kTC0CgJbJ0z/k7Jp9lY7l9t1+OJVPH6D2bK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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