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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b62ea061007ad0c6ad7b9fd2bb4201a19839b366c0c4723b89bec2f94c45e4e4' 
  AND token = '72WFcygJKCVP1HANNC46yQIcn44BJDr/3t6CcwfiCP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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