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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ec8eaf22c9363a7a4300f390c64cc3e858324bd87897a2a0df6a2351865ca7b' 
  AND token = 'gKba76ggvIS7rhRp6hXUPtns36CgZ9DWarxGnsVnXW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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