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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b42b2dee3b75a613c6d7a54cd7d83005344743e5adfe830cfe4503e4a1c542c2' 
  AND token = 'XPczMYJl5lEXyXJFmp2Nv/YGRcyCxjV6gbcGyJO7Xxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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