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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e2923052ba430e2df558d4fed5db87fdeb402ccd8e8581b589f6529b3ac8aa3' 
  AND token = 'pNALsn0ukK/mevNa95Lvbo6DuRs0nfWWPXkpj/zVw90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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