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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70d904f17e78961a69d6e57ad79f7035c68d8609b8842e4aa1ebe7f3a7bb00c6' 
  AND token = 'P6HgEX3OuXYTvwD5VIzPaC1ARy+ArcbTbnHIyjjtnrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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