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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a627f995e60853cec15b3754b49ba7d291d97f1ae0704a925d16a22c1b5ea2b3' 
  AND token = 'KRf3HxwzCE3VRtlOPgeqxhOm4aEorxC1RWILz9np7Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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