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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7575da26a7fddc536b3ab769e1c27da10edfcbf2e62d60cfccc730a5f4c76876' 
  AND token = 'Q8PKkp0kDe8gbhxvNMD/xcDG2YOvqnR6+HtDwf72328=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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