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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03e2a468a7e590002c59ac74d0cee6652f2b9e6929f924062e93ae9e0a09f86b' 
  AND token = 'KBMSdLFBXAAqoxeGsrU6beofr3swz+2vinuDc4E8wHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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