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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '654a7f6cce724a0a8369f24608361a7766fd02033d3709ded8bd9ddb9a2f2eb9' 
  AND token = 'PhVIpfkjtfPvI7lSasrEIWOhqnpyYUmB6mPb6yp7GME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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