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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020ecd110d98c6b8a37333d942f04e0a3c76b80f4ab3a7d4732cd212584fef25' 
  AND token = '3WuZbBR5vd3Afr1W/GEzotTCiuIeE+CoGYhEj2nQuP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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