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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f3382d0c14a14ad0169a8a462bf617444b0f20ec9bbf3d319a415ebbd9c8719' 
  AND token = 'BsI+4tnRsZMPTF5EYUC+FbR8JjHCv9bA8k6wzCLaeJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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