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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26c3326f2edd12f07e2955e7d4a5e6a649b5d470b134ebf4be5707d0017c166e' 
  AND token = 'HzS7XW+rHKBovAGl1M0UMiFKy3aS1iW8GXywxhUQjwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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