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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd658416ca036b309be8f8a234292d77ca6ace6a7f3b896764a1de526a8361fed' 
  AND token = 'IOCShBLJt5tL36xPi9yEHvHxLFCGSQP+5MQSUP2vqQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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