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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8fe31c5f999b68c5a13901b9c0ae67fab3e928f6b67324ae6328d566371f835' 
  AND token = 'b1g/wpQzwYr4Q2AFMwkBHbQdMewxwgdVmVem/B9Z51Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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