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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '558ecafb09c9cd508c0d1f24dbd7fb0eb5b444dc94635fbe57f36c77735e4552' 
  AND token = '2r6YxYFLVBQzynwkF/pOzms5stevEZeQJarL9lbd9P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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