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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd196ba7cde36dc7a9ab28633372aa9d0b3f3631065bcdd235d39f3505c5fdc47' 
  AND token = 'zy9lXAUdJJob51rm0iTC1y+Q0gSVK7wrcZuELvwILL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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