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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd84a70dd9de2fcf326a3bd75e45897ab0707490ec9408bbb9b62a16aea79793' 
  AND token = 'QZ0LuugBiXf3YCpXGn1hUx7iVatozqjnfkMkSr9Sn5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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