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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e475208bacd455ef44ea76cebd8265ffec078a1b14f64caf55c2d9b5f79a7cd7' 
  AND token = 'tDMV9ugGrox1dzJ3V+X1f0pIdNS/T8vXqNi15M06hCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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