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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56da57c9158bafe4bf97aa50fbc1bada81430e70b6358a20a7ebdea69d54b75e' 
  AND token = 'S73xfdJi/5IKj15eiIomVqEBbad3IuhF1DREKyrTNi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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