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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc74829497ff3199c359d4340bf1b0fe0c70b1adfb920be9ac10e6c34de2e507' 
  AND token = 'jzcbQOv1nH3EhyrejKwLDIvgcmmeh2szl0WJuNPpbIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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