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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b4130c9cce9b4266df3638c6bedc42567ee110ed2bdb8f4e45ef6f33e1aac2' 
  AND token = 'IVOXW8hTxY93LpZzYP+GRZqpD4El8VasOP4FZwAsPCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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