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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53adbc90f1a1d9705f4dd3d3282306eb96053096a70b9aae6a9af6f3fd6d5adc' 
  AND token = 'vX/aahV17pBP3ZLVFabLDuSr1oV6klYiNBUqw8O4sW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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