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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03be541d1bd81513e4610b8ea6610685ba781b6e45ae0fcb3dae563c7b32680e' 
  AND token = 'ciR6pgjUC4aGh86fexU6LN9V7to/NdA4V2wjBpdm2j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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