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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98000c77474c475f9613e3d33532709958677713a0e8e598691ba4a12273bc9f' 
  AND token = 'oWWxcDO7rlVs+hbYxAomsJ63K8knfesGHvrubA5YASs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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