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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d6e953dcd87764e56f0b379a58e83c321ce5f60e585235a0d92e71942b1035' 
  AND token = 'ciswGgcTQ/dgdvUQTIX8b1wQCeEUpAgcl2QLreCgDww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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