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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e0e159c68413435bd052ff4872ced885826cfce3bfbde2615f63d32a9a6d8b' 
  AND token = 'jaYkskME5LveRpbJWykdFL6MBdU+z4rjwSXrTz0ryUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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