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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b766b76e7e9bf407b8f35a0a1d2c24949599614269236fe0ef145865b1f1309' 
  AND token = '3AKmBQ+TEpxlR2U6m4VMzwe969+VUuBkKvA58pvh2g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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