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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '547816f8940b8e709d60c446cee20a75aff80b0266753c7eb6a52ed4c32ef3a4' 
  AND token = 'NaUEVpMW2gsSPXZISRYi1J9ufrnmXP6MmX3LtPv0Bmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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