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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9872b12e5e0eec7b9a1a79bed794a4d0fc1ef12173cbb82fa0f03df3dca606cf' 
  AND token = 'XJXVvVUAr8huzrXqcYPw5yZbviXi/CS401FGE2zCShM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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