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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '060415419ff785e8fa8776e71fddb40aa0b0d4ff7ef0e28794bc60a0cbba497f' 
  AND token = '9UsadPFdpXuQHA6JLMghbE7b65n0OoOYGN4RG10UBck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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