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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90eccb70b7f249e80c340f1285a39a1bd7c37a7c0c22f7155fe1419d4c65221a' 
  AND token = 'pjCjbVJNFVpU6s8CjNyJkE22d1EwRawnNdT84v7wT9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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