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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '752cfc0c4347e3da124eff9a5acd109131ff599895b7e31387455162cdb88b5a' 
  AND token = 'JzHOP1fiaEtTIyi7AfQXr5N00NTlpZD/MozUnJclCUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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