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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0966569dd3c0b4fffb20d710c00170010e33438fb79ee90486bd4f34f5f00093' 
  AND token = 'cxjr9stt78SFBxul+F+2+26UTkm85OHwByAdlTRavs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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