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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abbfdea1e8d315a07867ada8421622e57cce39a77b2a906c04bc712999908dec' 
  AND token = 'etuzExtM+/Y+Vqvv+iaaY0VtW3rn2TnJ4ftHx6bg3OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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