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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5354e280b70c1c4bf62fe57d0b9dc3ee3eecc0d8ab4de7508e841d7ff4c3b40b' 
  AND token = 'fde/suGodA9r3d5sqZc9V1vWMDxOoIRwHuQV8Qo4LJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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