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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0475b00e4fe00335c4d363cba6c82a0e5b78eaa2568c89924a2bfd26d71476a' 
  AND token = 'VxRCOCNgs93xETKZ2C9JwCKwuocI7tqiCfOUra04plI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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