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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f04bbf51b5583fe886c2b5c43f64b7704e30f344f07959aa93962a326640d6' 
  AND token = 'm0UKHrQLV5Q4Nl2yEoLcgEc81tXYHXemzO/5ZqlxgW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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