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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4af1ecdef85ab6b68a5e9b5f143ee0312b0751513869a2290ae7d414cfc61ee8' 
  AND token = 'JyoC0GgTGsZarW1PuEefe61Ah1E4WF9n8RRuIGBcQlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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