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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3457a3329c6b58cd247216106a988fa43fb90dd1f5168e38edceef14db35c70' 
  AND token = '3Js/ytaq2GaqkEeRpls6v6YlY+w/gdUn3idAdL6grpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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