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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a66bf6b70b063bebc31d12252e0c86f8b063182b2e57c24f82977019a9cc520' 
  AND token = 'Fe+LGjy/nd0vu3Dy0+uTzO9JJyEQkQt08JN/06SEYc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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