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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2af3ad890b065948a8b07864ef43f19533c22ef2131e74ca6b5707df20d421b' 
  AND token = 'lrr+an/zHLnQt0tLJSofQqcyLHeT2OJdPa7KSONqupw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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