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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e60ee88c895ab5cace09c922b457b0e248de9ba2e15c1f235e0c5be86b68b863' 
  AND token = 'sQugM+tUs84FN3LcJA41UKL1ggTPsOaeFia4kYj2RRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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