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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe7cd558523e0b7f6a2c3297fb83232698fde26d8c06b26d447c21dd9ed21a1' 
  AND token = 'OXlsBRUEQBoX7fb8oHWWmIAxaKMb1zBG4wLIz39fy9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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