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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1956f4a914c74e775ea06f350de2a7fc3688850d0d1e9762e87ee92d52abf9a' 
  AND token = 's/ucUs3hM0Xur27MIHeV5Qxe5MoVRDc7NrJ6tVIyrKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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