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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e702e45a753da2a5f77d22cd5383772593371c16f91701f2e8eb5c01ccd4530f' 
  AND token = 'XZeEE435mnLQ/Ajf9u4Wr9vpjbl4MP4Z0pKSANEqrLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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